Try the following steps.It worked for me
a>Stop the "Apache Tomcat" NT service from the Control 
Panel/Administrative Tools/Services
b>Invoke 'Task Manager' and end any "java.exe" processes.
c>Now start Tomcat from the "Program Menu"

Hope this helps!
Regards
Mahesh

> I'm trying to run Tomcat 4.0 under IIS 5.0 on my Windows 2000 Pro 
machine. 
> When I run startup.bat, I get the following error message:
> 
> Catalina.start: LifecycleException:  null.open:  java.net.BindException: 
> Address in use: JVM_Bind
> LifecycleException:  null.open:  java.net.BindException: Address in use: 
> JVM_Bind
>         at org.apache.catalina.connector.http.HttpConnector.initialize
> (HttpConnector.java:1116)
>         at org.apache.catalina.core.StandardService.initialize
> (StandardService.java:454)
>         at org.apache.catalina.core.StandardServer.initialize
> (StandardServer.java:552)
>         at org.apache.catalina.startup.Catalina.start(Catalina.java:775)
>         at org.apache.catalina.startup.Catalina.execute
(Catalina.java:681)
>         at org.apache.catalina.startup.Catalina.process
(Catalina.java:179)
>         at java.lang.reflect.Method.invoke(Native Method)
>         at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:243)
> ----- Root Cause -----
> java.net.BindException: Address in use: JVM_Bind
>         at java.net.PlainSocketImpl.socketBind(Native Method)
>         at java.net.PlainSocketImpl.bind(Unknown Source)
>         at java.net.ServerSocket.<init>(Unknown Source)
>         at java.net.ServerSocket.<init>(Unknown Source)
>         at 
org.apache.catalina.net.DefaultServerSocketFactory.createSocket
> (DefaultServerSocketFactory.java:118)
>         at org.apache.catalina.connector.http.HttpConnector.open
> (HttpConnector.java:946)
>         at org.apache.catalina.connector.http.HttpConnector.initialize
> (HttpConnector.java:1114)
>         at org.apache.catalina.core.StandardService.initialize
> (StandardService.java:454)
>         at org.apache.catalina.core.StandardServer.initialize
> (StandardServer.java:552)
>         at org.apache.catalina.startup.Catalina.start(Catalina.java:775)
>         at org.apache.catalina.startup.Catalina.execute
(Catalina.java:681)
>         at org.apache.catalina.startup.Catalina.process
(Catalina.java:179)
>         at java.lang.reflect.Method.invoke(Native Method)
>         at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:243)
> 
> 
> I believe I've set all the environmental variables properly. I tried 
> changing Tomcat's port in the server.xml file. I'm pretty lost here.
> 
> Thanks for any help in advance-
> --Andrew Badera